Interferometric Measurements Of The A-type Supergiant Deneb With The CHARA Array

Details Interferometric Measurements Of The A-type Supergiant Deneb With The CHARA Array Interferometric Measurements Of The A-type Supergiant Deneb With The CHARA Array

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.0601a&link_type=abstract

American Astronomical Society Meeting 208, #6.01; Bulletin of the American Astronomical Society, Vol. 38, p.84

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We have obtained precise interferometric measurements of the A-type supergiant Deneb (A2Ia) at the Center for High Angular Resolution Astronomy (CHARA) Array in the infrared K' band (1.94 to 2.34 microns) using the Fiber Linked Unit for Optical Recombination (FLUOR). Our observations were obtained over 20 nights in 2004 and 2005 with five telescope pairs E2-W2, W2-S2, W1-E2, E1-W1, and S1-W2. The projected baselines span 106 to 312 meters and sample the first and second lobes of Deneb's visibility curve. Our preliminary analysis reveals that the amplitude of the second lobe of the visibility curve is weaker than that predicted by a spherical hydrostatic model atmosphere.We also find that Deneb's angular diameter varies with position angle at the level of a few percent. We will present these data and discuss our analysis using a unified expanding model atmosphere and a rotationally distorted model atmosphere.This work was performed in part under contract with the Jet Propulsion Laboratory (JPL) funded by NASA through the Michelson Fellowship Program. JPL is managed for NASA by the California Institute of Technology. The CHARA Array is operated by the Center for High Angular Resolution Astronomy, Georgia State University, Atlanta, GA. Additional support comes from the National Science Foundation, the Keck Foundation and the Packard Foundation.

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